With “30 Rock” departing the airwaves after a not-unrespectable seven seasons – a particularly incredible achievement when you consider what an incredibly off-the-wall, insider-y sort of sitcom it was throughout its run – it seemed only appropriate to offer up some sort of tribute to the show in this week’s column. Unfortunately, since everyone else seems to have swiped all of the good angles that are 100% show-specific (indeed, I actually wrote a piece on the 30 best “30 Rock” guest stars for the “Today” blog, The Clicker), I had to think a little bit outside the box, but since a key aspect of the series was its show within a show, “TGS with Tracy Jordan,” it seemed like a perfectly reasonable concept to spotlight 30 of TV’s great fictional TV series. Lord knows these aren’t all of them, of course. Hell, even limiting myself to a one-fake-TV-series-per-real-TV-series rule…with the only exception being “30 Rock,” which seemed only fair, given the reason for the list in the first place…there are still thousands of omissions, so feel free to offer up your personal favorites that didn’t make the cut, “Family Guy” fans. (There’ve been so many on that show, I didn’t even know where to start.)

1. TGS with Tracy Jordan (“30 Rock”)

For those who can remember back to the pilot of “30 Rock,” Liz Lemon (Tina Fey) was originally in charge of a not-terribly-great sketch comedy series called “The Girlie Show,” but when GE’s new Head of East Coast Television and Microwave Oven Programming, Jack Donaghy made an executive decision to add the completely unpredictable Tracy Jordan (Tracy Morgan) to the show, the comedian’s ego necessitated a change in the show’s title to feature his name more prominently. 136 episodes later, we’ve scarcely seen a single “TGS” sketch in its entirety, and what bits we have seen have rarely been funny (at least not intentionally), but the shenanigans surrounding the series have been consistently hysterical.

2. The Alan Brady Show (“The Dick Van Dyke Show”)

Dick Van Dyke has discussed on many occasions how many TV writers have come up to him over the years and told him that the biggest reasons they decided to break into the business in the first place was because Rob Petrie and his cronies on Alan Brady’s variety show made it look like one of the most entertaining occupations in the world. Strangely, he hasn’t spoken nearly as much about how many of those writers finished their comments by yelling, “Thanks for nothing, you big liar!” I’m betting it’s about 50/50.

By the way, although “The Alan Brady Show” wasn’t real, the folks at MeTV talked Carl Reiner into doing a promo for the addition of “The Dick Van Dyke Show” to their line-up where he reprised the character. Funny stuff.

3. Invitation to Love (“Twin Peaks”)

If you’re not a David Lynch obsessive, you may not remember this soap opera, but those with keen eyes will recall that it turned up at least once in each of the first seven episodes of “Twin Peaks.” It’s also worth noting that “Invitation to Love” pointedly features identical-twin characters played by the same actress, which – in no way coincidentally – was more or less what Sheryl Lee did as Laura Palmer and Maddy Ferguson.

The best bit about this cartoon-with-a-cartoon was the fact that the “Spongebob” show runners reunited former “McHale’s Navy” co-stars Ernest Borgnine and Tim Conway to prove the characters’ respective voices. It doesn’t get much cooler than that.

5. The Terrence and Phillip Show (“South Park”)

Disproving a longstanding theory that Canadians can’t be funny while cementing the not-really-in-question suspicion that farts are always funny, it need only be said that Terrence and Phillip are a stone-cold gas. Sadly, this clip is from their movie, “Asses of Fire,” rather than their series, but it’s basically the same thing. Y’know, except filthier. Much, much filthier.

It’s Thanksgiving Eve ’round Bullz-Eye HQ as I write this piece, which means that anyone here who’s still working wants to be doing it about as little as I do. In fact, the biggest reason I’ve waited this long into the evening to get moving on the piece is because I’ve spent way too much of my day watching a marathon of a certain series on the USA Network…which brings me to the premise of this week’s column. Lord knows it’s become a small-screen staple for networks to offer programming which provides the one-two punch of 1) allowing the employees of these networks to do as little work as possible, and 2) inspiring all those TV viewers with Tryptophan surging through their veins to set down their remotes and bask in as many episodes of their favorite show as their holiday weekend downtime will allow.

Now you’re wondering what marathons you can catch this weekend, right? Well, there are a few good ones out there, to be sure: